How do i disable object momentum?

I have a swinging platform but when i jump off my characters velocity is hugely increased.

Is there a way to reduce the momentum that you gain from standing on a moving object or disabling it completely?

in your character movement component in your pawn/character, there are a couple variables you can play with to control this. jump z velocity, air control, friction, etc. are good places to start tuning your character controls.